Journal of the American Oil Chemists' Society

, Volume 93, Issue 10, pp 1393–1397 | Cite as

Eco-friendly Pretreatment of Oil with High Free Fatty Acid Content Using a Sulfamic Acid/Ethanol System

  • Patrick Martins de Oliveira
  • Luana Machado Farias
  • Joaquín A. Morón-Villarreyes
  • Marcelo G. Montes D’Oca
Original Paper


In recent years, sulfamic acid (SA, NH2SO3H) has emerged as a novel green catalyst for organic synthesis because of several advantages, including its non-volatility, non-hygroscopicity, non-corrosivity, and low cost. This work reports the use of sulfamic acid as a catalyst in the pretreatment of oil with a high content of free fatty acids (10 and 20 % FFA) in ethanol or methanol. The process (esterification reaction) used in the pretreatment of the oil was carried out under a variety of conditions, initial fatty acid content, temperature, type of alcohol, and  % catalyst. The experiments using an NH2SO3H/ethanol system resulted in a high fatty acid ethyl ester conversion, 88.53 % (±0.95) from an initial acidity of 40 mg KOH/g (20 % FFA), using 8 % NH2SO3H as the catalyst. According to the results, the methodology using sulfamic acid and ethanol demonstrated elevated potential for a environmentally-friendly means of biodiesel production.


Pretreatment Low-cost feedstock Free fatty acids Biodiesel Esterification Sulfamic acid Green catalyst 



The authors would like to thank the Ministry of Science and Technology (MCT)/Research and Projects Financing (FINEP) and CNPq (National Council for Scientific and Technological Development) for financial support.

Compliance with Ethical Standards

Conflict of interest

The authors have declared no conflict of interests.


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Copyright information

© AOCS 2016

Authors and Affiliations

  • Patrick Martins de Oliveira
    • 1
  • Luana Machado Farias
    • 1
  • Joaquín A. Morón-Villarreyes
    • 1
  • Marcelo G. Montes D’Oca
    • 1
  1. 1.Laboratório Kolbe de Síntese Orgânica, Escola de Química e Alimentos, Programa de Pós-Graduação em Química Tecnológica e AmbientalUniversidade Federal do Rio Grande-FURGRio GrandeBrazil

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